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From my point of view these are excellent, both in terms of sound and isolation, plus they look extremely elegant.
I am not a 'golden ear' and can't really say much about the harmonics and sound spectrum as I'm really a complete noob here. However even for me I think I'd like a bit more punchy and powerful bass. Nevertheless the sound is basically music to the ears.
I...” --iXpertMan

VS-K1 is a tri-band silver-line balanced-ear ,cavity use all-metal cutting process excellent resolving power, high elongation, low-frequency elastic density superb, Naiting sound is a highthe quality of the HI-FI headphones.It is suitable for all kinds of music to listen and popular vocal jazz rock.

Visang R02 is an earphone with equilibration. The high, medium, and low frequency distribution is average. It works well and grabbed a frequency and not to influence another frequency. The sound is up, good clean and fresh. This earphone sound great for the price. Their sound quality easily compares with products costing 2-3 times as much. Isolation and comfort levels are also very good. A...

The R03 is an up-market professional-level earphone from well-known Chinese manufacturer ViSang. With quality materials used all-around, the build of the R03 is as venerable as the sound. Metal shells and a Cu-Ag alloy cable ensure longevity while the 10.7mm dynamic driver delivers crisp, powerful, and engaging sound. A uniquely patterned cable sheath provides flexibility and reduces cable...